**Core Concept**
The question tests the interaction between antibiotics and neuromuscular blocking agents, specifically how certain antibiotics can potentiate the effects of pancuronium. This is a critical concept in pharmacology, as it can have significant implications for patient care.

**Why the Correct Answer is Right**
Streptomycin, an aminoglycoside antibiotic, can exacerbate neuromuscular blockade by inhibiting the release of acetylcholine at the neuromuscular junction. This is due to its ability to bind to the calcium channels on the presynaptic neuron, reducing the amount of calcium available for acetylcholine release. As a result, the effects of pancuronium, a non-depolarizing neuromuscular blocking agent, are amplified. This interaction is particularly concerning in patients receiving both streptomycin and pancuronium, as it can lead to prolonged respiratory paralysis.

**Why Each Wrong Option is Incorrect**
**Option B:** Erythromycin is a macrolide antibiotic that can prolong the QT interval and cause cardiac arrhythmias, but it does not have a direct effect on neuromuscular blockade.
**Option C:** Penicillin G is a beta-lactam antibiotic that works by inhibiting cell wall synthesis and does not interact with neuromuscular blocking agents.
**Option D:** Chloramphenicol is a broad-spectrum antibiotic that inhibits protein synthesis, but it does not have a significant effect on neuromuscular blockade.

**Clinical Pearl / High-Yield Fact**
When using aminoglycoside antibiotics like streptomycin, it is essential to monitor patients closely for signs of neuromuscular blockade, especially when concurrently administering neuromuscular blocking agents like pancuronium. This can be achieved through regular monitoring of vital signs, including respiratory rate and depth.

**✓ Correct Answer: A. Streptomycin**